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Since a neutron has no charge, it must become positively charged after emitting an electron. Of course, there are all sorts of uncertainties involved.

How much Sr-87 was in the rock when it first formed?

Most likely, that is the least important source of error.That’s just over half a percent error in something that is supposedly multiple billions of years old.Of course, that error estimate is complete nonsense.If those rocks really have been sitting around on the moon for billions of years, I suspect that the the wide range of physical and chemical processes which occurred over that time period had a much more profound effect on the uncertainty of the age determination.This is best illustrated by the radioactive age of a sample of diamonds from Zaire.

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